. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 FOREWORD The apicomplexan protozoal parasites continue to provide major challenges for human and animal health. While most of us have some familiarity with the ravages of malaria, there is relatively little awareness of diseases caused by parasites of the Theileria species. The reason is that these tick-borne